by Chris Woodyard, USA TODAY

by Chris Woodyard, USA TODAY

Chevrolet just took the wraps off the new 2014 Malibu, which is now roomier and more fuel efficient in a bid to try to push its way back to the top of the auto industry's biggest sales segment, midsize sedans.

The Malibu, which had seen sales droop in recent months against even tougher competition, will get more knee room in the back seat and a new version of the 2.5-liter four-cylinder engine, with new fuel-saving technologies.

With updated styling, General Motors hopes Malibu will sell on looks again as well. Buyers will note the change right away from its new front end. The appearance now is closer to its big sister, the redesigned 2014 Impala full-size sedan. The changes are a very quick refresh of the Malibu that was redesigned for 2013.

"The 2014 Chevrolet Malibu builds on the strengths established by the all-new 2013 Malibu to make it a stronger choice for customers," said Mark Reuss, GM's president for North America. "The midsize sedan segment is the most contested in the industry and we're not sitting still with the 2014 Chevrolet Malibu."

The new Malibu goes on sale in the fall.

One of its biggest draws will be the new engine. Chevy says that with variable valve lift and the ability to shut off at stop lights, it will have estimated gas mileage of 23 miles per gallon in the city and 35 mpg on the highway. That's a 5% improvement in the city and 3% more on the highway.

More back seat space was achieved my making the front seat backs slightly thinner. It is becoming a common practice in the auto industry.

The new Malibu faces Ford's redone Fusion, which comes in hybrid and plug-in versions as well, a new Mazda6, an aging Hyundai Sonata and perennial top sellers Toyota Camry (redone for 2012), Honda Accord (new for 2013) and Nissan Altima (also new for 2013). The segment accounts for roughly one in four new vehicles sold in the U.S. so success in it is essential for mainstream brands.